The package obarun-keyring was made to facilited the work about gpg key.

So, to make the change 
$ sudo pacman -Syy obarun-keyring
$ sudo mv /etc/pacman.d/gnupg /etc/pacman.d/gnupg.bak
$ sudo haveged -w 1024
$ sudo pacman-key --init
$ sudo pacman-key --populate archlinux
$ sudo pacman-key --populate obarun
$ sudo killall haveged
related ?
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
error: could not open file /var/lib/pacman/sync/obarun.db: Unrecognized archive format
resolving dependencies...
looking for conflicting packages...
your database seem corrupted
try with double y on the command line please : 
$ sudo pacman -Syy
eric wrote 
$ sudo pacman -Syy
just once or every time ?

TIA !
archie wrotejust once or every time ?
Sometimes the database will glitch like this for instance: 
error: failed retrieving file 'obarun.db' from www.obarun.org : Unknown SSL protocol error in connection to www.obarun.org:443
Eric is fully aware of this bug, The only way to workaround it is to do -Sy{y,u}
So yes i strongly recommend doing it everytime you upgrade.

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